Bug 1388980 - Simplify compiler selection, r=franziskus

--HG--
extra : histedit_source : d3b877fd64d2a438f0517fc951bbf5947c5593cf

build.sh

@@ -73,6 +73,8 @@ while [ $# -gt 0 ]; do
         -j) ninja_params+=(-j "$2"); shift ;;
         -v) ninja_params+=(-v); verbose=1 ;;
         --test) gyp_params+=(-Dtest_build=1) ;;
+        --clang) export CC=clang; export CCC=clang++; export CXX=clang++ ;;
+        --gcc) export CC=gcc; export CCC=g++; export CXX=g++ ;;
         --fuzz) fuzz=1 ;;
         --fuzz=oss) fuzz=1; fuzz_oss=1 ;;
         --fuzz=tls) fuzz=1; fuzz_tls=1 ;;

help.txt

@@ -19,6 +19,8 @@ NSS build tool options:
     --gyp|-g         force a rerun of gyp
     --opt|-o         do an opt build
     -m32             do a 32-bit build on a 64-bit system
+    --clang          build with clang and clang++
+    --gcc            build with gcc and g++
     --test           ignore map files and export everything we have
     --fuzz           build fuzzing targets (this always enables test builds)
                      --fuzz=tls to enable TLS fuzzing mode

readme.md

@@ -41,49 +41,8 @@ directory `lib`, and tools in directory `bin`. In order to run the tools, set
 your system environment to use the libraries of your build from the "lib"
 directory, e.g., using the `LD_LIBRARY_PATH` or `DYLD_LIBRARY_PATH`.
 
-    Usage: build.sh [-hcv] [-j <n>] [--nspr] [--gyp|-g] [--opt|-o] [-m32]
-                    [--test] [--pprof] [--scan-build[=output]] [--ct-verif]
-                    [--asan] [--ubsan] [--msan] [--sancov[=edge|bb|func|...]]
-                    [--disable-tests] [--fuzz[=tls|oss]] [--system-sqlite]
-                    [--no-zdefs] [--with-nspr] [--system-nspr] [--enable-libpkix]
-
-    This script builds NSS with gyp and ninja.
-
-    This build system is still under development.  It does not yet support all
-    the features or platforms that NSS supports.
-
-    NSS build tool options:
-
-        -h               display this help and exit
-        -c               clean before build
-        -v               verbose build
-        -j <n>           run at most <n> concurrent jobs
-        --nspr           force a rebuild of NSPR
-        --gyp|-g         force a rerun of gyp
-        --opt|-o         do an opt build
-        -m32             do a 32-bit build on a 64-bit system
-        --test           ignore map files and export everything we have
-        --fuzz           build fuzzing targets (this always enables test builds)
-                         --fuzz=tls to enable TLS fuzzing mode
-                         --fuzz=oss to build for OSS-Fuzz
-        --pprof          build with gperftool support
-        --ct-verif       build with valgrind for ct-verif
-        --scan-build     run the build with scan-build (scan-build has to be in the path)
-                         --scan-build=/out/path sets the output path for scan-build
-        --asan           do an asan build
-        --ubsan          do an ubsan build
-                         --ubsan=bool,shift,... sets specific UB sanitizers
-        --msan           do an msan build
-        --sancov         do sanitize coverage builds
-                         --sancov=func sets coverage to function level for example
-        --disable-tests  don't build tests and corresponding cmdline utils
-        --system-sqlite  use system sqlite
-        --no-zdefs       don't set -Wl,-z,defs
-        --with-nspr      don't build NSPR but use the one at the given location, e.g.
-                         --with-nspr=/path/to/nspr/include:/path/to/nspr/lib
-        --system-nspr    use system nspr. This requires an installation of NSPR and
-                         might not work on all systems.
-        --enable-libpkix make libpkix part of the build.
+See [help.txt](https://hg.mozilla.org/projects/nss/raw-file/tip/help.txt) for
+more information on using build.sh.
 
 ## Building NSS (legacy build system)