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[Driver] Turn off optimization when -g option is passed. #15820

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[Driver] Turn off optimization when -g option is passed. #15820

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16 changes: 14 additions & 2 deletions clang/lib/Driver/ToolChains/Clang.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5600,8 +5600,13 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
CmdArgs.push_back("-Wno-sycl-strict");
}

// Set O2 optimization level by default
if (!Args.getLastArg(options::OPT_O_Group))
// '-g' option turns off optimization -O2 and makes -O0 the default.
if (Arg *A = Args.getLastArg(options::OPT_g_Group)) {
if (A->getOption().matches(options::OPT_g_Flag))
CmdArgs.push_back("-O0");
}
// Set O2 optimization level by default if no -g option is passed.
if (!Args.getLastArg(options::OPT_O_Group) && !Args.getLastArg(options::OPT_g_Group))
CmdArgs.push_back("-O2");

// Add the integration header option to generate the header.
Expand Down Expand Up @@ -10806,6 +10811,13 @@ void SPIRVTranslator::ConstructJob(Compilation &C, const JobAction &JA,

// Partially copied from clang/lib/Frontend/CompilerInvocation.cpp
static std::string getSYCLPostLinkOptimizationLevel(const ArgList &Args) {

// '-g' option turns off optimization -O2 and makes -O0 the default.
if(Arg *A = Args.getLastArg(options::OPT_g_Group)) {
if (A->getOption().matches(options::OPT_g_Flag))
return "-O0";
}

if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
// Pass -O2 when the user passes -O0 due to IGC
// debugging limitation. Note this only effects
Expand Down
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