Revert "gcc: Always pass --enable-shared by default"

This reverts commit 8e48232.

Since pkgsStatic.stdenv.cc can only produce static binaries, there's
no reason to include that compilers e.g. libstdc++.so.

pkgs/development/compilers/gcc/10/default.nix

@@ -8,12 +8,7 @@
 , profiledCompiler ? false
 , langJit ? false
 , staticCompiler ? false
-, # N.B. the defult is intentionally not from an `isStatic`. See
-  # https://gcc.gnu.org/install/configure.html - this is about target
-  # platform libraries not host platform ones unlike normal. But since
-  # we can't rebuild those without also rebuilding the compiler itself,
-  # we opt to always build everything unlike our usual policy.
-  enableShared ? true
+, enableShared ? !stdenv.targetPlatform.isStatic
 , enableLTO ? !stdenv.hostPlatform.isStatic
 , texinfo ? null
 , perl ? null # optional, for texi2pod (then pod2man)

pkgs/development/compilers/gcc/11/default.nix

@@ -8,12 +8,7 @@
 , profiledCompiler ? false
 , langJit ? false
 , staticCompiler ? false
-, # N.B. the defult is intentionally not from an `isStatic`. See
-  # https://gcc.gnu.org/install/configure.html - this is about target
-  # platform libraries not host platform ones unlike normal. But since
-  # we can't rebuild those without also rebuilding the compiler itself,
-  # we opt to always build everything unlike our usual policy.
-  enableShared ? true
+, enableShared ? !stdenv.targetPlatform.isStatic
 , enableLTO ? !stdenv.hostPlatform.isStatic
 , texinfo ? null
 , perl ? null # optional, for texi2pod (then pod2man)

pkgs/development/compilers/gcc/4.8/default.nix

@@ -8,12 +8,7 @@
 , profiledCompiler ? false
 , langJit ? false
 , staticCompiler ? false
-, # N.B. the defult is intentionally not from an `isStatic`. See
-  # https://gcc.gnu.org/install/configure.html - this is about target
-  # platform libraries not host platform ones unlike normal. But since
-  # we can't rebuild those without also rebuilding the compiler itself,
-  # we opt to always build everything unlike our usual policy.
-  enableShared ? true
+, enableShared ? !stdenv.targetPlatform.isStatic
 , enableLTO ? !stdenv.hostPlatform.isStatic
 , texinfo ? null
 , perl ? null # optional, for texi2pod (then pod2man); required for Java

pkgs/development/compilers/gcc/4.9/default.nix

@@ -8,12 +8,7 @@
 , profiledCompiler ? false
 , langJit ? false
 , staticCompiler ? false
-, # N.B. the defult is intentionally not from an `isStatic`. See
-  # https://gcc.gnu.org/install/configure.html - this is about target
-  # platform libraries not host platform ones unlike normal. But since
-  # we can't rebuild those without also rebuilding the compiler itself,
-  # we opt to always build everything unlike our usual policy.
-  enableShared ? true
+, enableShared ? !stdenv.targetPlatform.isStatic
 , enableLTO ? !stdenv.hostPlatform.isStatic
 , texinfo ? null
 , perl ? null # optional, for texi2pod (then pod2man); required for Java

pkgs/development/compilers/gcc/6/default.nix

@@ -9,12 +9,7 @@
 , profiledCompiler ? false
 , langJit ? false
 , staticCompiler ? false
-, # N.B. the defult is intentionally not from an `isStatic`. See
-  # https://gcc.gnu.org/install/configure.html - this is about target
-  # platform libraries not host platform ones unlike normal. But since
-  # we can't rebuild those without also rebuilding the compiler itself,
-  # we opt to always build everything unlike our usual policy.
-  enableShared ? true
+, enableShared ? !stdenv.targetPlatform.isStatic
 , enableLTO ? !stdenv.hostPlatform.isStatic
 , texinfo ? null
 , flex

pkgs/development/compilers/gcc/7/default.nix

@@ -7,12 +7,7 @@
 , profiledCompiler ? false
 , langJit ? false
 , staticCompiler ? false
-, # N.B. the defult is intentionally not from an `isStatic`. See
-  # https://gcc.gnu.org/install/configure.html - this is about target
-  # platform libraries not host platform ones unlike normal. But since
-  # we can't rebuild those without also rebuilding the compiler itself,
-  # we opt to always build everything unlike our usual policy.
-  enableShared ? true
+, enableShared ? !stdenv.targetPlatform.isStatic
 , enableLTO ? !stdenv.hostPlatform.isStatic
 , texinfo ? null
 , perl ? null # optional, for texi2pod (then pod2man)

pkgs/development/compilers/gcc/8/default.nix

@@ -7,12 +7,7 @@
 , profiledCompiler ? false
 , langJit ? false
 , staticCompiler ? false
-, # N.B. the defult is intentionally not from an `isStatic`. See
-  # https://gcc.gnu.org/install/configure.html - this is about target
-  # platform libraries not host platform ones unlike normal. But since
-  # we can't rebuild those without also rebuilding the compiler itself,
-  # we opt to always build everything unlike our usual policy.
-  enableShared ? true
+, enableShared ? !stdenv.targetPlatform.isStatic
 , enableLTO ? !stdenv.hostPlatform.isStatic
 , texinfo ? null
 , perl ? null # optional, for texi2pod (then pod2man)

pkgs/development/compilers/gcc/9/default.nix

@@ -9,12 +9,7 @@
 , profiledCompiler ? false
 , langJit ? false
 , staticCompiler ? false
-, # N.B. the defult is intentionally not from an `isStatic`. See
-  # https://gcc.gnu.org/install/configure.html - this is about target
-  # platform libraries not host platform ones unlike normal. But since
-  # we can't rebuild those without also rebuilding the compiler itself,
-  # we opt to always build everything unlike our usual policy.
-  enableShared ? true
+, enableShared ? !stdenv.targetPlatform.isStatic
 , enableLTO ? !stdenv.hostPlatform.isStatic
 , texinfo ? null
 , perl ? null # optional, for texi2pod (then pod2man)