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Mitigate issues related to compiler options when cross-compiling (#21330)

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* Document C compiler options config when cross-compiling

* Allow empty string to override default
This commit is contained in:
Francis Thérien 2023-02-22 15:10:02 -05:00 • committed by GitHub
commit 7dc80a7fef
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2 changed files with 8 additions and 4 deletions
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4
compiler/extccomp.nim
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@ -328,7 +328,9 @@ proc getConfigVar(conf: ConfigRef; c: TSystemCC, suffix: string): string =
platform.OS[conf.target.targetOS].name & '.' & platform.OS[conf.target.targetOS].name & '.' &
CC[c].name & fullSuffix CC[c].name & fullSuffix
result = getConfigVar(conf, fullCCname) result = getConfigVar(conf, fullCCname)
if result.len == 0: if existsConfigVar(conf, fullCCname):
result = getConfigVar(conf, fullCCname)
else:
# not overridden for this cross compilation setting? # not overridden for this cross compilation setting?
result = getConfigVar(conf, CC[c].name & fullSuffix) result = getConfigVar(conf, CC[c].name & fullSuffix)
else: else:

8
doc/nimc.md
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@ -316,14 +316,16 @@ Another way is to make Nim invoke a cross compiler toolchain:
nim c --cpu:arm --os:linux myproject.nim nim c --cpu:arm --os:linux myproject.nim
``` ```
For cross compilation, the compiler invokes a C compiler named For cross compilation, the compiler invokes a C compiler named like
like `$cpu.$os.$cc` (for example arm.linux.gcc) and the configuration `$cpu.$os.$cc` (for example `arm.linux.gcc`) with options defined in
system is used to provide meaningful defaults. For example for `ARM` your `$cpu.$os.$cc.options.always`. The configuration system is used to provide
meaningful defaults. For example, for Linux on a 32-bit ARM CPU, your
configuration file should contain something like: configuration file should contain something like:
arm.linux.gcc.path = "/usr/bin" arm.linux.gcc.path = "/usr/bin"
arm.linux.gcc.exe = "arm-linux-gcc" arm.linux.gcc.exe = "arm-linux-gcc"
arm.linux.gcc.linkerexe = "arm-linux-gcc" arm.linux.gcc.linkerexe = "arm-linux-gcc"
arm.linux.gcc.options.always = "-w -fmax-errors=3"
Cross-compilation for Windows Cross-compilation for Windows
============================= =============================