[chromium-dev] How can I overwrite the cflags/cxxflags (rtti and exceptions) in my module? (gn build system)

[Samuel Yang]

Hi,

I have my own module and have a BUILD.gn , I have added the flags as below.
However, there are still -fno-rtti and -fno-exceptions after -frtti and
-fexceptions in the compile log.

How can I just enable rtti and exception in my module but disable rtti and
exceptions the others in chromium(It already did)? Great thanks.

cflags = [
"-fexceptions",
"-frtti",
]

cflags_cc = [
"-fexceptions",
"-frtti",
]

[Thiago Farina]

Post by Samuel Yang
Hi,
I have my own module and have a BUILD.gn , I have added the flags as
below. However, there are still -fno-rtti and -fno-exceptions after -frtti
and -fexceptions in the compile log.
How can I just enable rtti and exception in my module but disable rtti and
exceptions the others in chromium(It already did)? Great thanks.
cflags = [
"-fexceptions",
"-frtti",
]
cflags_cc = [
"-fexceptions",
"-frtti",
]

In your BUILD.gn try doing:

configs -= [ "//build/config/gcc:no_exceptions" ]
--
Thiago Farina

[Thiago Farina]

Post by Thiago Farina

Post by Samuel Yang
Hi,
I have my own module and have a BUILD.gn , I have added the flags as
below. However, there are still -fno-rtti and -fno-exceptions after -frtti
and -fexceptions in the compile log.
How can I just enable rtti and exception in my module but disable rtti
and exceptions the others in chromium(It already did)? Great thanks.
cflags = [
"-fexceptions",
"-frtti",
]
cflags_cc = [
"-fexceptions",
"-frtti",
]

configs -= [ "//build/config/gcc:no_exceptions" ]

configs -= [ "//build/config/compiler:no_rtti" ]

configs += [ "//build/config/compiler:rtti" ]

Example:
https://cs.chromium.org/chromium/src/gpu/khronos_glcts_support/BUILD.gn?q=no_exceptions&sq=package:chromium&l=272&dr=C
--
Thiago Farina

[Samuel Yang]

Thank you. It works.

圚 2016幎10月20日星期四 UTC+8䞋午7:08:13Thiago Farina写道

Post by Thiago Farina

Post by Thiago Farina

Post by Samuel Yang
Hi,
I have my own module and have a BUILD.gn , I have added the flags as
below. However, there are still -fno-rtti and -fno-exceptions after -frtti
and -fexceptions in the compile log.
How can I just enable rtti and exception in my module but disable rtti
and exceptions the others in chromium(It already did)? Great thanks.
cflags = [
"-fexceptions",
"-frtti",
]
cflags_cc = [
"-fexceptions",
"-frtti",
]

configs -= [ "//build/config/gcc:no_exceptions" ]

configs -= [ "//build/config/compiler:no_rtti" ]
configs += [ "//build/config/compiler:rtti" ]
https://cs.chromium.org/chromium/src/gpu/khronos_glcts_support/BUILD.gn?q=no_exceptions&sq=package:chromium&l=272&dr=C
--
Thiago Farina

[Samuel Yang]

Is it possible that I only want to particular files enable rtti but not the
whole module?



圚 2016幎10月20日星期四 UTC+8䞋午7:08:13Thiago Farina写道

Post by Thiago Farina

Post by Thiago Farina

Post by Samuel Yang
Hi,
I have my own module and have a BUILD.gn , I have added the flags as
below. However, there are still -fno-rtti and -fno-exceptions after -frtti
and -fexceptions in the compile log.
How can I just enable rtti and exception in my module but disable rtti
and exceptions the others in chromium(It already did)? Great thanks.
cflags = [
"-fexceptions",
"-frtti",
]
cflags_cc = [
"-fexceptions",
"-frtti",
]

configs -= [ "//build/config/gcc:no_exceptions" ]

configs -= [ "//build/config/compiler:no_rtti" ]
configs += [ "//build/config/compiler:rtti" ]
https://cs.chromium.org/chromium/src/gpu/khronos_glcts_support/BUILD.gn?q=no_exceptions&sq=package:chromium&l=272&dr=C
--
Thiago Farina

[Krzysztof Olczyk]

You may put them in the separate source_set-s.
--
Best regards,
*Krzysztof Olczyk*
Software Developer & Architect
TVSDK Core team

Opera TV
Pl. Teatralny 8, 50-051 Wroclaw, Poland

Post by Samuel Yang
Is it possible that I only want to particular files enable rtti but not
the whole module?
圚 2016幎10月20日星期四 UTC+8䞋午7:08:13Thiago Farina写道

Post by Thiago Farina

Post by Thiago Farina

Post by Samuel Yang
Hi,
I have my own module and have a BUILD.gn , I have added the flags as
below. However, there are still -fno-rtti and -fno-exceptions after -frtti
and -fexceptions in the compile log.
How can I just enable rtti and exception in my module but disable rtti
and exceptions the others in chromium(It already did)? Great thanks.
cflags = [
"-fexceptions",
"-frtti",
]
cflags_cc = [
"-fexceptions",
"-frtti",
]

configs -= [ "//build/config/gcc:no_exceptions" ]

configs -= [ "//build/config/compiler:no_rtti" ]
configs += [ "//build/config/compiler:rtti" ]
Example: https://cs.chromium.org/chromium/src/gpu/khronos_gl
cts_support/BUILD.gn?q=no_exceptions&sq=package:chromium&l=272&dr=C
--
Thiago Farina
--

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[David Turner]

What you propose would turn on exceptions and RTTI for _all_ code compiled,
which is not desirable, nor what the initial question was about.

An answer closer to being correct would be to remove the "no_rtti" and
"no_exceptions" configs the specific module, and replace them with "rtti"
and "exceptions", e.g. something like:


source_set("foo_module") {
sources = [ ... ]
...
configs -= [ "//build/config/compiler:no_rtti" ]
configs += [ "//build/config/compiler:rtti" ]
configs -= [ "//build/config/compiler:no_exceptions" ]
configs += [ "//build/config/compiler:exceptions" ]
}

Post by u***@gmail.com
declare_args(){
...
use_rtti = false
use_exceptions = false
...
}
set to false by default.
In the same file, add a switch to config("no_rtti") and config(
config("no_rtti") {
if (!use_rtti) {
if (is_win) {
cflags_cc = [ "/GR-" ]
} else {
cflags_cc = [ "-fno-rtti" ]
cflags_objcc = cflags_cc
}
}
}
config("no_exceptions") {
if (!use_exceptions){
if (is_win) {
# Disables exceptions in the STL.
# libc++ uses the __has_feature macro to control whether to use exceptions,
# so defining this macro is unnecessary. Defining _HAS_EXCEPTIONS to 0 also
# breaks libc++ because it depends on MSVC headers that only provide certain
# declarations if _HAS_EXCEPTIONS is 1. Those MSVC headers do not use
# exceptions, despite being conditional on _HAS_EXCEPTIONS.
if (!use_custom_libcxx) {
defines = [ "_HAS_EXCEPTIONS=0" ]
}
} else {
cflags_cc = [ "-fno-exceptions" ]
cflags_objcc = cflags_cc
}
}
}
gn gen out/default --args='use_rtti=true use_exceptions=true'
圚 2016幎10月20日星期四 UTC+8䞋午4:44:17Samuel Yang写道

Post by Samuel Yang
Hi,
I have my own module and have a BUILD.gn , I have added the flags as
below. However, there are still -fno-rtti and -fno-exceptions after -frtti
and -fexceptions in the compile log.
How can I just enable rtti and exception in my module but disable rtti
and exceptions the others in chromium(It already did)? Great thanks.
cflags = [
"-fexceptions",
"-frtti",
]
cflags_cc = [
"-fexceptions",
"-frtti",
]
--

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