build: expose option to enable or disable precompiled std headers

They are enabled by default, and Meson will also prints whether or not
they're enabled at the bottom at the end of configuration.

Change-Id: I48db238510bf9e74340b86f243f4bbe360794281

7 files changed, 7 insertions, 7 deletions

diff --git a/src/libcmd/meson.build b/src/libcmd/meson.build
index 4dc0714c8..3d92f36a4 100644
--- a/src/libcmd/meson.build
+++ b/src/libcmd/meson.build
@@ -54,7 +54,7 @@ libcmd = library(
     nlohmann_json,
     lix_doc
   ],
-  cpp_pch : ['../pch/precompiled-headers.hh'],
+  cpp_pch : cpp_pch,
   install : true,
   # FIXME(Qyriad): is this right?
   install_rpath : libdir,
diff --git a/src/libexpr/meson.build b/src/libexpr/meson.build
index e60a85b5d..080fdb443 100644
--- a/src/libexpr/meson.build
+++ b/src/libexpr/meson.build
@@ -145,7 +145,7 @@ libexpr = library(
   include_directories : [
     '../libmain',
   ],
-  cpp_pch : ['../pch/precompiled-headers.hh'],
+  cpp_pch : cpp_pch,
   install : true,
   # FIXME(Qyriad): is this right?
   install_rpath : libdir,
diff --git a/src/libfetchers/meson.build b/src/libfetchers/meson.build
index ee38b6cda..b66d0b9f9 100644
--- a/src/libfetchers/meson.build
+++ b/src/libfetchers/meson.build
@@ -30,7 +30,7 @@ libfetchers = library(
     liblixutil,
     nlohmann_json,
   ],
-  cpp_pch : ['../pch/precompiled-headers.hh'],
+  cpp_pch : cpp_pch,
   install : true,
   # FIXME(Qyriad): is this right?
   install_rpath : libdir,
diff --git a/src/libmain/meson.build b/src/libmain/meson.build
index 075aa83b2..a7cce287c 100644
--- a/src/libmain/meson.build
+++ b/src/libmain/meson.build
@@ -20,7 +20,7 @@ libmain = library(
     liblixutil,
     liblixstore,
   ],
-  cpp_pch : ['../pch/precompiled-headers.hh'],
+  cpp_pch : cpp_pch,
   install : true,
   # FIXME(Qyriad): is this right?
   install_rpath : libdir,
diff --git a/src/libstore/meson.build b/src/libstore/meson.build
index 7a129d22c..fa363bd19 100644
--- a/src/libstore/meson.build
+++ b/src/libstore/meson.build
@@ -220,7 +220,7 @@ libstore = library(
     nlohmann_json,
   ],
   cpp_args : cpp_args,
-  cpp_pch : ['../pch/precompiled-headers.hh'],
+  cpp_pch : cpp_pch,
   install : true,
   # FIXME(Qyriad): is this right?
   install_rpath : libdir,
diff --git a/src/libutil/meson.build b/src/libutil/meson.build
index 8c3377e76..f6d14a11b 100644
--- a/src/libutil/meson.build
+++ b/src/libutil/meson.build
@@ -129,7 +129,7 @@ libutil = library(
     openssl,
     nlohmann_json,
   ],
-  cpp_pch : ['../pch/precompiled-headers.hh'],
+  cpp_pch : cpp_pch,
   implicit_include_directories : true,
   install : true,
 )
diff --git a/src/nix/meson.build b/src/nix/meson.build
index 8115a3d08..22f148fcb 100644
--- a/src/nix/meson.build
+++ b/src/nix/meson.build
@@ -89,7 +89,7 @@ nix = executable(
     boehm,
     nlohmann_json,
   ],
-  cpp_pch : ['../pch/precompiled-headers.hh'],
+  cpp_pch : cpp_pch,
   install : true,
   # FIXME(Qyriad): is this right?
   install_rpath : libdir,